Canon EOS-1D C - Manual (Page 263)

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Q Quick Control During Playback
To rotate an image, set [51: Auto rotate] to [OnzD]. If [51: Auto rotate]
is set to [OnD] or [Off], the [b Rotate image] setting will be recorded to
the image, but the camera will not rotate the image for display.
Press the button during index display to switch to the single-image
display and the Quick Control screen will appear. Pressing the
button again will return to the index display.
For images taken with another camera, the functions you can select may
be limited.
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